A couple of hours of hike from GiriGanga takes you to Kupper top. The trail goes alongside the stream for some time then goes straight up to the top through the jungle. There were a couple of meadows in between as well. The best part is, the ground is full of wild flowers as it looks awesome over the valley.
Link of part 1:
https://www.tripoto.com/trip/hidden-gems-of-himachal-kharapatthar-6068d3a86e6fe
Link of part 2:
https://www.tripoto.com/trip/hidden-gems-of-himachal-kharapatthar-part-2-60699e191fa16